1965 Valiant 200 convertible (minor project)

Snooping around last night, I found some speakers behind the rear quarters. These look to be newer 6.5", 3-way speakers, but they aren't hooked up. I'll try to trace out the wires and get them hooked up when I get the new stereo installed.
I wonder how much you can hear them when there are no speaker grills in that area on a convertible?
rear speaker.jpg
rear qp.jpg